(Originally posted 7/27/17 on Read With The Gringa.)
While the world has been distracted with all things Trump, everyone seems to have forgotten that the world’s worst industrial disaster is still unfolding. Yeah, remember Fukushima? That nuclear reactor that had 3 cores melt down after a 9.0 earthquake triggered a 15-meter tsunami that devastated Japan? Would you, dear reader, like the gringa, like to know what the heck is still going on? Well, Ima gonna tell ya. First, the basics on the history:
March 11, 2011: After said earthquake and tsunami, 3 of the 4 cores of the Fukushima Daiichi reactors melted down over the course of three days.
The World Nuclear Organization (WNO) rated the disaster a 7 on the INES scale. What the heck is that, the dear reader asks? And what the heck does it mean?
The INES is an international standard used to measure the significance of a nuclear event primarily determined by the amount of radiation ionization exposure. There is no higher rating than a 7. That being said, the gringa would like to know is Fukushima a true 7 or is it listed as a 7 simply because there is no higher rating to assign? I mean, would an INES rating of 9 or 15 or 28 be a more honest reflection of what happened? But I digress. Back to what a 7 actually means as we know it.
Fukushima was given a 7 because during days #4 through #6 a total of 940 PBq (1-131 eq) was released of radioactive material. But what does that mean?
PBq does not stand for “Please Be Quiet” with regard to Fukushima. It refers to the metric measurement of radioactivity. It is shorthand for Petabecquerel. It’s root word, becquerel, is defined as:
“… the activity of a quantity of radioactive material in which one nucleus decays per second.”
When the prefix “peta” is attached it becomes a measurement equal to 10 to the fifteenth power becquerels. In other words, one-thousand-billion. Crazy number, huh? So Fukushima released 940 thousand billion radioactive nuclei into the sea and atmosphere. Sounds pretty awful, right? So why is the world’s media and national leaders seemingly unconcerned? Are they correct in their “no big deal” assessment? Should we just move on and continue letting the Trump circus and side-show dominate our attention?
Fukushima’s atmospheric radioactive releases had 2 primary contaminants: volatile iodine-131 and caesium-137. The iodine has a half-life of 8 days. No big deal there. The caesium, on the other hand, is a really big deal. It is easily carried throughout the atmosphere, has a 30-year half-life, so wherever it finally lands it’s going to be there for a very long time, a silent and invisible invader. But is it deadly?
Caesium is soluble. That means the human body can absorb it. The good news is that it does not concentrate within internal organs. After about 70 days the body is rid of the substance.
The most highly concentrated atmospheric releases were detected around the end of March 2011. The good news is that in mid-March Japan had already anticipated this problem and taken preventative measures.
A dust-suppressing polymer resin had been applied around the nuclear plant to suppress fallout, preventing the iodine and caesium from becoming mobile through wind and rain. By 2012, effective permanent covers were in place to contain fallout from atmospheric releases. Nearby crops of rice have been tested and reveal that caesium levels are one-quarter of the allowable limit. That means there is Fukushima rice for sale. Yum.
The worst news from Fukushima is that run-off of contaminated water into the sea was profuse and well above allowable levels of radionuclides. Although storage tanks for contaminated water were eventually erected, they began leaking in 2013. In addition to this is the more than 10,000 cubic meters of “slightly” contaminated water purposely released into the sea by Japan. This was a deal with the devil. They had to release less-contaminated water in order to make room for storing highly-contaminated water.
All sorts of new technology has been quickly developed by innovators eager to help Japan clean-up radioactive water quicker and more effectively. The gringa finds it sad how catastrophe inspires innovation. But I won’t knock it. Better to be desperate and have options than to be desperate and hopeless.
Concrete panels were constructed to prevent further leakage of contaminated water into the harbor surrounding Fukushima. These were later reinforced with steel shielding that extends one kilometer through rock strata. Testing of harbor waters in 2013 indicate that contamination levels are below acceptable standards. But is this good news? Who decides what is safe when it comes to contamination?
When it comes to interpreting contamination results for the harbor, Japan refers to the World Health Organization’s (WHO) standard for drinking water. The harbor surrounding Fukushima tests consistently lower for caesium contamination that the WHO requires for safe drinking water. Sounds pretty safe to me. But what about the fish and stuff? Can you eat what you catch?
The gringa thinks so. You see, prior to 2012 the Japanese national standard was for food sources not to exceed 500 Bq/kg of caesium contamination. After the disaster, this standard was dropped to 100 Bq/kg. What this means is that although they dropped the measurement standard they raised the standard for expectations. In order for fish caught off of Japan’s shores to be eligible for sale and dining pleasure, they have to test for less caesium now than before the disaster. And what do the fish say?
Within the months immediately after the disaster, more than 50% were too contaminated to eat. By the summer of 2014 things had changed dramatically. In about 3 years 99.4% of fish caught in the harbor surrounding Fukushima were safe to eat. Not bad, Japan, not bad.
But what about the doom and gloom reports about a wave of sea-borne Fukushima radiation that is finally reaching the shores of other nations? Well, first keep in mind that there are pre-existing levels of caesium radiation in the earth’s oceans. That would be the caesium-137 isotope contamination caused by nuclear weapons testing decades ago. Thanks, United States.
But there is another caesium isotope, #134, floating around the Pacific. It can only have originated from Fukushima. The good news is that instead of having a half-life of 30 years, like #137, it only sticks around for about 2 years. But here it is 2017, 5 years after the disaster. Why is it still floating around in the Pacific? Well, to understand that you have to understand what half-life means.
Having a 2-year half-life doesn’t mean that #134 will disappear or become non-radioactive in 2 years. It means that it takes 2 years for it to lose half of its radioactive value. So, let’s do the math:
- 5 years ago # 134 is full strength
- 3 years ago #134 is half strength
- 1 year ago up to present #134 is one-quarter strength
But is the Pacific Ocean deadly? The Environmental Protection Agency (EPA) has regularly tested and monitored west coast waters, fully aware of the potential for deadly radioactivity due to Fukushima. The results of Fukushima radiation off the coast of California average to about 2 Becquerels per cubic meter.
Since 7400 becquerels per cubic meter are the standard for safe drinking water, it seems California beach bums are safe. Even if a beach bum stays in the water non-stop for an entire year, their radiation exposure would be about the same as sitting for an x-ray at the dentist. So surf at your pleasure, beach bums.
So what does all of this mean? The worst man-made/natural combo disaster a human could imagine occurred 5 years ago. Amazingly enough, human ingenuity was up to the task. Fukushima is not going to kill the planet. And according to the latest findings recovered by robotic explorers, Fukushima will most likely be officially de-commissioned. Now who is inspired to become a scientist?
Image Credit: Suffolk University Blogs
Video Credit: New Scientist